1216603315508 has 72 divisors (see below), whose sum is σ = 2500466734080. Its totient is φ = 516391397760.

The previous prime is 1216603315469. The next prime is 1216603315513. The reversal of 1216603315508 is 8055133066121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 137760653 + ... + 137769483.

It is an arithmetic number, because the mean of its divisors is an integer number (34728704640).

Almost surely, 2^{1216603315508} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1216603315508, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1250233367040).

1216603315508 is an abundant number, since it is smaller than the sum of its proper divisors (1283863418572).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1216603315508 is a wasteful number, since it uses less digits than its factorization.

1216603315508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15525 (or 15516 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 41.

The spelling of 1216603315508 in words is "one trillion, two hundred sixteen billion, six hundred three million, three hundred fifteen thousand, five hundred eight".